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Additional sensors are only required if monitoring electricity usage in a multiple phase (ie 3-phase) installation.
Typical domestic installations are single phase only requiring a single sensor, 2 extra sensors per OWL will be necessary for 3 phase where the cable is up to 10mm diameter.
Current measuring :0.1-70A
·Voltage measuring :110-250Vac
·Power accurancy :<3%
Suitable for up to 70A per phase.